Thickness of wood-frame extension to meet BR.

Discussion in 'Builders' Talk' started by David DD, Feb 14, 2019.

  1. David DD

    David DD Member

    I want to add a small extension in an area 1.8 x 3m on the side of my house, primarily as use as a utility and storage room. Access would be via an existing external door.
    Use of double skin brick walls with cavity would make the interior far too small so I was thinking of using wood frame construction with Kingspan-type insulation and plasterboard on top.
    How thick would such a wall need to be to meet building regs? (The floor and roof will be similarly constructed). I was thinking 100mm thick.
  2. Jord86

    Jord86 Well-Known Member

  3. stevie22

    stevie22 Active Member

    5x2 optimum. Stronger than 4x2 but you have room for 100 celotex between studs with an airga.

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